Mold for forming concrete slabs



G. E. NAGEL MOLD FOR FORMING CONCRETE SLABS March 12, 1929.

Filed NOV. 10, 1927 2 sn'ggts sheet '1 Snow dot March 12, 1929. G. E. NAGEL MQLD FOR FORMING CONCRETE SLABS 2 sheets-sheet Filed NOV. 10, 1,927

llllllll! w ww xh Patented Mar. 12, 1929.

UNITED STATES 1,705,201 enrznr oFFics.

GEORGE E. NAGEL, 0F GEEEHVILLCE, OHIO.

MOLD FOR FORMING CONCRETE SLABS.

Application filed November This invention relates to molds particular- 1y adapted for the formation of concrete slabs.

The primary object of the invention is the provision of a mold from which the slabs may be quickly and easily discharged after the concrete has properly set.

It is rather advantageousthat the wear sustaining surface of the finished slab be a little larger than the base portion of the slab and as the wear sustaining surface is formed by the bottom of the mold, the present invention contemplates a mold having a flexible bottom and sides whose upper portions may be contracted prior to the concrete mix being placed therein, so that, after the mix has set, said sides may be released, permittingthem to flex outwardly, whereupon the finishedslab may be easily and quickly removed.

The mold shown in the present instance is especially designed for the production of slabs used between the rails at railroad grade crossings and as it is desirable to provide means for anchoring the slabs between said rails, the mold is provided with means for facilitating the formation of depressions or sockets in the finished slab for co-operation with suitable anchoring means.

With these and other objects in View, the invention consists in certain novel details of construction and combinations and arrangements of parts all as will be hereinafter more fully described and the novel features thereof particularly pointed out in the appended claims.

in the drawings,-

Figure 1 a topplan view of a mold embodying the present invention; 1

Fig. 2 a side elevational view of the mold;

Fig. 8 is an end elevational view of a portion of an end of the mold adjacent to the side shown in Fig. 2.

Fig. i is a longitudinal sectional view through an end portion of the mold.

Fig. 5 is a detail sectional view through the side wall of the mold shown in Fig. 2.

The present mold comprises a base 10 of suitable resilient material which will permit of being flexed and attached to said base as by rivets 11 are the side walls 12, 13. It will be understood that the face of the slab formed at the bottom of the mold is actually the wear sustaining surface for the finished slab, and in order that the wear sustaining surface may be of a little larger area than the bottom of 10, 1927. Serial No. 232,402.

ing up the nut 16 the two walls 12 are contract-ed or moved toward one another so as to be brought in contact with the tapered ends of walls 13.

VValls 13'are also adapted to be flexed inwardly and for this purpose there is mount-.

ed on rod 14L a caml? whosecamming surface when the handle portion 18 is raised is adapted to permit walls 12 to flex outwardly. -lowever, by turning handle 18 downwardl i a y as shown in dotted lines in Fig. 8 walls 13 may be flexed inwardly or contracted as in the case of walls 12. /Vith this arrangement the cross section of the finished slab is reduced at its base as compared with the area of the wear sustaining surface, which, as pointed out, is formed at the bottom of the mold. It will be understood that the ex paneling and contracting means just described are provided at two opposite sides of the mold, and after the slab has been formed such contracting meansare released so that all four sides are again free to flex outwardly, after which the mold may be inverted by turning on truuuions 19 to discharge the molded slab.

As before mentioned, the present mold is especially designed for the formation of slabs to be used in forming the road surface at railroad rade crossings. Such slabs should be provided with means for anchoring them, as otherwise they are aptto rise upwardly between the rails to some extent and either cause undue strains to be placed upon their corners or at least have a detrimental effect on otherwise smooth road surface. For this reason the present mold has two of its opposite sides formed with apertures 20 into which pins may be projected when the concrete mix I is being deposited in the mold. After the concrete is set and before it is attempted to remove the slab from the mold said pins, one of which is indicated at 21, are withdrawn leaving what might be termed a socket in the finished mold. In the event it is desired to form the inolds Without sockets, the flexible plate 22 is pivoted at one end to the side of the mold in proxiniity to each of opei'iings 20 and at their free ends these plates are provided with projections 23 conformin in configuration to the cross section oit apertnres 20 so that by turning said plates until the projections 23 come into registry with openings 20 said plates will beforce'd into the openings by the resiliency of the plates Preterably' pi'o'jectioj' ssh-e ol th sani'e'iv'i lth as the Wz'flls of the" n'lold so t I fares will lie iiush it h the inner surfaces of said Walls, thereby producing a substantially smooth sui Co on the lini'shedslab.

1. A niold comprising aresilie'nt bottoni,

side i'talli-l rigidly mounted on said bOttOlfii,

two ofsaid Walls being' of reduced length at their upper edges W'hei'eliiy, when the bcittoln of the IHClCl' is flexed to position the other two sides against the ends of the sides of rediiced length the cross section of the mold will be reduced at its upper portion, and

"- meansfor forcing sal'id Wells against the Walls of reduced length:

2. A. mold comprising a" resilient bottom, side walls rigidwith saidbottoni, two of said walls being of reduced length at their upper edge and two other sides being adapted to be moved against the ends ofsaid first two Walls by flexing said bottom, and means carried by said Walls for flexing said bottom;

A mold con'iprisingzf a resilient bottom, side Walls rigid with said'bottoni, two of said Walls being of reduced iength at their upper edge and two other sides being adapted to be moved against the ends of said first two Walls by flexing said bottom, rods connecting two of said Walls and means on said rods for forcing the upper all of the Walls inwardiy Wit spec 45; A inoli side walls rigid with said bottom two of said walls being of red'iice'dlength at their upper edge and two other s" ies being adaptedto be moved against the ends of'szi Kl In; two walls by flexing said bottom, rods illUUllLCd on two i of said Walls, means on said rods ior contracting' the upper eice off said Walls, and Cain members on sa' :1 rods adapted to force the upper edges'of the other two Walls inwardly.

5. A ln'oldt'or railroad crossing slabs conipi isingr a" bottom and side Walls, one of said side Walls having an aperture therein, aplate pivoted on said Wall, and a Pi'OjGCilOll on said pia'te having across section coiitorniii'ig to the configuration of said aperture, ssid projectionbeing a: lapted to be positioned in said aperture, i

GEORGE E- NAGEL.

1 comprising a resident botton'i, 

